The surface of low voltage formed foil for Al electrolysis capacitors is treated with phosphoric acid solution.The effects of concentration of phosphoric acid solution,temperature and process time on specific capacitance and the time of hydration resistance with standing voltage are studied.The optimum condition is presented.The properties of low voltage formed foil have been improved by applying this method on the product line.


Low voltage formed foil, Phosphoric acid, Specific capacitance, Hydration resistance

Publication Date


Online Available Date


Revised Date


Received Date



[1]A lw itt R S.The anod ic oxidation of alum inum in thepresence of a hydrated oxide[J].J.E lectro.Chem.Soc.,1967,114(8):843~848.
[2]A lw itt R S.Crystalline anod ic oxide film s on alum inum[J].Japanese M etal Surface Technology,1981,32(5):226~234.
[3]Shen X ing-su(沈行素),Yan Ji-xin(严季新).Com-posite crystalline anod ic oxide film on alum inumⅠ.Form ing of anod ic alum inum oxide film in the presenceof hydrous oxide layer[J].E lectron ic Components andM aterials(in Ch inese),1996,15(4):12~19.
[4]Chen Guo-guang(陈国光),Cao W an-zhen(曹婉真).E lectrolytic Capac itors[M].X i’an:X i’an Jiaotong U-n iversity Press,1993.
[5]W e i Chun-cai(韦春才),Zhao Quan-zhu(赵泉柱).Form ing m echan ism and improving approach on defectin alum inum anode oxide film[J].Journal of ShenyangPolytechn ic Un iversity,1999,21(1):48~49.
[6]JiangM e i-lian(蒋美连),Feng Zhe-sheng(冯哲圣),Chen Jin-ju(陈金菊),et al.Hydration resistancetreatm ent on anod ic alum ina film s for alum inum electro-lytic capac itors[J].E lectron ic Components and M ate-rials,2005,24(8):53~55.



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.